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This commit is contained in:
Gavin Hayes 2023-02-01 14:35:26 -05:00
parent 7e37378945
commit 97f430335e
4 changed files with 27 additions and 18 deletions
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4
libc/runtime/mmap.c
View file

@ -487,7 +487,9 @@ void *mmap(void *addr, size_t size, int prot, int flags, int fd, int64_t off) {
void *res;
size_t toto;
if (__isfdkind(fd, kFdZip)) {
return _weaken(__zipos_mmap)(addr, size, prot, flags, (struct ZiposHandle *)(intptr_t)g_fds.p[fd].handle, off);
return _weaken(__zipos_mmap)(
addr, size, prot, flags,
(struct ZiposHandle *)(intptr_t)g_fds.p[fd].handle, off);
}
#if defined(SYSDEBUG) && (_KERNTRACE || _NTTRACE)
if (IsWindows()) {

14
libc/zipos/mmap.c
View file

@ -27,8 +27,8 @@
#include "libc/sysv/errfuns.h"
#include "libc/zipos/zipos.internal.h"
#define IP(X) (intptr_t)(X)
#define VIP(X) (void *)IP(X)
#define IP(X) (intptr_t)(X)
#define VIP(X) (void *)IP(X)
/**
* Map zipos file into memory. See mmap.
@ -46,7 +46,8 @@
* it does not need to be 64kb aligned.
* @return virtual base address of new mapping, or MAP_FAILED w/ errno
*/
void *__zipos_mmap(void *addr, size_t size, int prot, int flags, struct ZiposHandle *h, int64_t off) {
void *__zipos_mmap(void *addr, size_t size, int prot, int flags,
struct ZiposHandle *h, int64_t off) {
if (VERY_UNLIKELY(!!(flags & MAP_ANONYMOUS))) {
STRACE("MAP_ANONYMOUS zipos mismatch");
return VIP(einval());
@ -65,9 +66,10 @@ void *__zipos_mmap(void *addr, size_t size, int prot, int flags, struct ZiposHan
return MAP_FAILED;
}
const int64_t beforeOffset = __zipos_lseek(h, 0, SEEK_CUR);
if ((beforeOffset == -1) || (__zipos_read(h, &(struct iovec){outAddr, size}, 1, off) == -1) ||
(__zipos_lseek(h, beforeOffset, SEEK_SET) == -1) ||
((prot != tempProt) && (mprotect(outAddr, size, prot) == -1))) {
if ((beforeOffset == -1) ||
(__zipos_read(h, &(struct iovec){outAddr, size}, 1, off) == -1) ||
(__zipos_lseek(h, beforeOffset, SEEK_SET) == -1) ||
((prot != tempProt) && (mprotect(outAddr, size, prot) == -1))) {
const int e = errno;
munmap(outAddr, size);
errno = e;

3
libc/zipos/zipos.internal.h
View file

@ -48,7 +48,8 @@ ssize_t __zipos_write(struct ZiposHandle *, const struct iovec *, size_t,
int64_t __zipos_lseek(struct ZiposHandle *, int64_t, unsigned) _Hide;
int __zipos_fcntl(int, int, uintptr_t) _Hide;
int __zipos_notat(int, const char *) _Hide;
void *__zipos_mmap(void *, uint64_t, int32_t, int32_t, struct ZiposHandle *, int64_t) _Hide;
void *__zipos_mmap(void *, uint64_t, int32_t, int32_t, struct ZiposHandle *,
int64_t) _Hide;
#ifdef _NOPL0
#define __zipos_lock() _NOPL0("__threadcalls", __zipos_lock)

24
test/libc/runtime/mmap_test.c
View file

@ -226,7 +226,9 @@ TEST(mmap, ziposCannotBeAnonymous) {
int fd;
void *p;
ASSERT_NE(-1, (fd = open(ziposLifePath, O_RDONLY), "%s", ziposLifePath));
EXPECT_SYS(EINVAL, MAP_FAILED, (p = mmap(NULL, 0x00010000, PROT_READ, MAP_PRIVATE | MAP_ANONYMOUS, fd, 0)));
EXPECT_SYS(EINVAL, MAP_FAILED,
(p = mmap(NULL, 0x00010000, PROT_READ, MAP_PRIVATE | MAP_ANONYMOUS,
fd, 0)));
close(fd);
}
@ -234,7 +236,8 @@ TEST(mmap, ziposCannotBeShared) {
int fd;
void *p;
ASSERT_NE(-1, (fd = open(ziposLifePath, O_RDONLY), "%s", ziposLifePath));
EXPECT_SYS(EACCES, MAP_FAILED, (p = mmap(NULL, 0x00010000, PROT_READ, MAP_SHARED, fd, 0)));
EXPECT_SYS(EACCES, MAP_FAILED,
(p = mmap(NULL, 0x00010000, PROT_READ, MAP_SHARED, fd, 0)));
close(fd);
}
@ -245,8 +248,9 @@ TEST(mmap, ziposCow) {
int fd;
void *p;
ASSERT_NE(-1, (fd = open(ziposLifePath, O_RDONLY), "%s", ziposLifePath));
EXPECT_NE(MAP_FAILED, (p = mmap(NULL, 0x00010000, PROT_READ, MAP_PRIVATE, fd, 0)));
EXPECT_STREQN("ELF", ((const char *)p)+1, 3);
EXPECT_NE(MAP_FAILED,
(p = mmap(NULL, 0x00010000, PROT_READ, MAP_PRIVATE, fd, 0)));
EXPECT_STREQN("ELF", ((const char *)p) + 1, 3);
EXPECT_NE(-1, munmap(p, 0x00010000));
EXPECT_NE(-1, close(fd));
}
@ -259,14 +263,14 @@ TEST(mmap, ziposCowFileMapReadonlyFork) {
void *p;
ASSERT_NE(-1, (fd = open(ziposLifePath, O_RDONLY), "%s", ziposLifePath));
EXPECT_NE(MAP_FAILED, (p = mmap(NULL, 4, PROT_READ, MAP_PRIVATE, fd, 0)));
EXPECT_STREQN("ELF", ((const char *)p)+1, 3);
EXPECT_STREQN("ELF", ((const char *)p) + 1, 3);
ASSERT_NE(-1, (ws = xspawn(0)));
if (ws == -2) {
ASSERT_STREQN("ELF", ((const char *)p)+1, 3);
ASSERT_STREQN("ELF", ((const char *)p) + 1, 3);
_exit(0);
}
EXPECT_EQ(0, ws);
EXPECT_STREQN("ELF", ((const char *)p)+1, 3);
EXPECT_STREQN("ELF", ((const char *)p) + 1, 3);
EXPECT_NE(-1, munmap(p, 6));
EXPECT_NE(-1, close(fd));
}
@ -279,7 +283,8 @@ TEST(mmap, ziposCowFileMapFork) {
void *p;
char lol[4];
ASSERT_NE(-1, (fd = open(ziposLifePath, O_RDONLY), "%s", ziposLifePath));
EXPECT_NE(MAP_FAILED, (p = mmap(NULL, 6, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0)));
EXPECT_NE(MAP_FAILED,
(p = mmap(NULL, 6, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0)));
memcpy(p, "parnt", 6);
ASSERT_NE(-1, (ws = xspawn(0)));
if (ws == -2) {
@ -308,8 +313,7 @@ TEST(mmap, cow) {
path);
EXPECT_EQ(5, write(fd, "hello", 5));
EXPECT_NE(-1, fdatasync(fd));
EXPECT_NE(MAP_FAILED,
(p = mmap(NULL, 5, PROT_READ, MAP_PRIVATE, fd, 0)));
EXPECT_NE(MAP_FAILED, (p = mmap(NULL, 5, PROT_READ, MAP_PRIVATE, fd, 0)));
EXPECT_STREQN("hello", p, 5);
EXPECT_NE(-1, munmap(p, 5));
EXPECT_NE(-1, close(fd));